PNG_IMAGE_PIXEL_ 3010 png.h             PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt)
PNG_IMAGE_PIXEL_ 3016 png.h             PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt)
PNG_IMAGE_PIXEL_ 3021 png.h          #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt)